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Rex is Latin for "king", see Rex (king). Specifically, it was the title of the kings of ancient Rome.

The term may also refer to:



  • Rex, Georgia, an unincorporated community in Clayton County, United States
  • Rex, North Carolina, a census-designated place in Robeson County, United States
  • Rex River, a river in the U.S. state of Washington
  • Mount Rex, an isolated mountain in Antarctica

Literature and performing arts[edit]

Fictional characters[edit]


Animated television series[edit]

  • Rex Banner, a one-time character in The Simpsons appearing in the episode "Homer vs. the Eighteenth Amendment"
  • Rex Raptor, a character in the seriesYu-Gi-Oh!
  • Rex, the title character in the series Generator Rex
  • Rex, the title character in the claymation series Rex the Runt
  • Rex, the clone trooper captain who served as General Anakin Skywalker's second-in-command in the series Star Wars: The Clone Wars

Live-action television series[edit]

Other fiction[edit]

  • Rex, a locomotive in The Railway Series books and the spin-off series Thomas and Friends.
  • Rex (NX Files), a character in the action adventure web-show NX Files
  • Metal Gear REX, a mecha from the video game, Metal Gear Solid
  • Rex the Wonder Dog, a DC Comics superhero dog
  • Rex Morgan, M.D., a comic strip and its title character







  • SS Rex, an Italian luxury ship, sunk by Allied bombers off the coast of Slovenia in 1944


Energy and fuels[edit]


Computing and technology[edit]

  • The REX prefix used by the x86-64 instruction encoding
  • REXX (originally named Rex), a computer programming language
  • .rex (disambiguation) file extensions used by REXX and REX2
  • REX 5000, a series of personal digital assistants
  • REX 6000, a series of personal digital assistants
  • Rex (software), a remote execution, configuration management and software deployment system
  • Rex (video game), a 1988 game for the ZX Spectrum and Amstrad CPC
  • REX, an audio file format; see REX2
  • REX OS, a real-time operating system developed by Qualcomm
  • Samsung REX, a series of affordable feature phones
  • REX is an abbreviation for "request to exit", a push-button or motion detector used for access control